Adventure of the Engineer's Thumb, The (The Adventures of Sherlock Holmes, Episode 9)

An engineer, Victor Hatherley, attends Dr Watson's surgery after his thumb is chopped off, and recounts his tale to Watson and Holmes. Hatherley had been hired for 50 guineas to repair a machine he was told compressed Fuller's earth into bricks. Hatherley was told to keep the job confidential, and was transported to the job in a carriage with frosted glass, to keep the location secret. He was shown the press, but on closer inspection discovered a "crust of metallic deposit" on the press, an...